Question

Work out the area of a circle with diameter of 1.8cm take pi to be 3.142 and give your answer to 1 decimal place

Answer 1

A =2.5 cm^2

Explanation:

The area of a circle is

A = pi r^2 where r is the radius

r = d/2 where d is the diameter

r = 1.8 /2 = .9

A = 3.142 ( .9)^2

A=2.54502

Round to 1 decimal place

A =2.5 cm^2